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Finding the Fourth Proportional to 407.48, 611.22 and 99.33

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Solution

The fourth proportional to 407.48, 611.22 and 99.33 is: 149.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.48 : 611.22 = 99.33 : x
  2. Step 2: Convert to fraction form
    407.48/611.22 = 99.33/x
  3. Step 3: Cross multiply
    407.48x = 611.22 × 99.33
  4. Step 4: Simplify right side
    407.48x = 60,711.99
  5. Step 5: Solve for x
    x = 60,711.99/407.48
  6. Step 6: Final answer
    x = 149.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.